Roughness-gradient-induced spontaneous motion of droplets on hydrophobic surfaces: A lattice Boltzmann study

被引：42

作者：

Moradi, N. ^{[1
]}

Varnik, F. ^{[1
,2
]}

Steinbach, I. ^{[1
]}

机构：

[1] Ruhr Univ Bochum, ICAMS, D-44801 Bochum, Germany

[2] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

来源：

EPL | 2010年 / 89卷 / 02期

关键词：

CONTACT-ANGLE HYSTERESIS; SUPERHYDROPHOBIC SURFACES; PATTERNED SURFACES; SOLID-SURFACES; WETTABILITY; DYNAMICS; DROPS; FLOWS; WATER;

D O I：

10.1209/0295-5075/89/26006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The effect of a step-wise change in the pillar density on the dynamics of droplets is investigated via three-dimensional lattice Boltzmann simulations. For the same pillar density gradient but different pillar arrangements, both motion over the gradient zone as well as complete arrest are observed. In the moving case, the droplet velocity scales approximately linearly with the texture gradient. A simple model is provided reproducing the observed linear behavior. The model also predicts a linear dependence of droplet velocity on surface tension. This prediction is clearly confirmed via our computer simulations for a wide range of surface tensions. Copyright (C) EPLA, 2010

引用

页数：6

共 30 条

[1] Lattice Boltzmann simulations of contact line motion. I. Liquid-gas systems [J].